XML file read/write, add, modify, delete operation

XML file read/write, add, modify, delete operation
using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Web;
Using System.Web.SessionState;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.HtmlControls;
Using System.Xml;
Private XmlDocument xmldoc;

Load XML file
private void Loadxml ()
{
Xmldoc=new XmlDocument ();
Xmldoc.load (Server.MapPath ("User.xml"));
}

Add node
private void AddElement ()
{

Loadxml ();

XmlNode xmldocselect=xmldoc.selectsinglenode ("user");

XmlElement el=xmldoc.createelement ("person"); Add Person node
El.setattribute ("Name", "Wind and Cloud"); Add the Person node's property ' name '
El.setattribute ("Sex", "female"); Add the property "sex" of the person node
El.setattribute ("Age", "25"); Add the property "age" of the person node

XmlElement xesub1=xmldoc.createelement ("Pass"); Add a node in the person node
xesub1.innertext= "123";//Set Text node
El.appendchild (XESUB1);
XmlElement xesub2=xmldoc.createelement ("address");
xesub2.innertext= "Kunming";/Set Text node
El.appendchild (XESUB2);

Xmldocselect.appendchild (EL);
Xmldoc.save (Server.MapPath ("User.xml"));
}

modifying nodes
private void Updateelement ()
{
Loadxml ();
XmlNodeList Nodelist=xmldoc.selectsinglenode ("user"). childnodes;//get all child nodes of bookstore node
foreach (XmlNode xn in nodelist)//traverse all child nodes
{
XmlElement xe= (XmlElement) xn;//Converts a child node type to a XmlElement type
if (Xe.getattribute ("name") = = "Cloud")//If the Name property value is "cloud"
{
Xe.setattribute ("name", "invention");

If there are child nodes down here
XmlNodeList nls=xe.childnodes;//continues to acquire all child nodes of the XE child node
foreach (XmlNode xn1 in NLS)//traversal
{
XmlElement xe2= (XmlElement) xn1;//conversion type
if (xe2.name== "pass")//If found
{
xe2.innertext= "66666";//Modify
Break
}
}

Break
}
}
Xmldoc.save (Server.MapPath ("User.xml"))//Save
}

Delete a node
private void Deletenode ()
{

Loadxml ();
XmlNodeList Xnl=xmldoc.selectsinglenode ("user"). ChildNodes;

foreach (XmlNode xn in xnl)
{
XmlElement xe= (XmlElement) xn;

if (Xe.getattribute ("name") = = "Invention")
{
Xe.removeattribute ("name");//Delete Name property
Xe.removeall ()//delete all contents of the node
Break
}
}
Xmldoc.save (Server.MapPath ("User.xml"))//Save
}

private void Showit ()
{
Loadxml ();
XmlNode xn=xmldoc.selectsinglenode ("user");

XmlNodeList Xnl=xn.childnodes;

foreach (XmlNode xnf in XNL)
{
XmlElement xe= (XmlElement) xnf;
Console.WriteLine (Xe.getattribute ("name"))//Display property value
Console.WriteLine (Xe.getattribute ("Sex"));
//
XmlNodeList Xnf1=xe.childnodes;
foreach (XmlNode xn2 in Xnf1)
//                {
Console.WriteLine (Xn2.innertext),//Display child node point text
//                }

}

       }
   
XML style:
<?xml version= "1.0" encoding= "gb2312"
<user>
  < Person>
  </person>
  <person name= "Wind Pull" sex= "man" age= ""
    < Pass>123</pass>
    <address> daming </address>
  </person>
  <person Name= "The Wind and Cloud" sex= "female" age= "" "
    <pass>123</pass>
     <address> Kunming </address>
  </person>
</user>